Abstract
In light of the new U.S. Federal regulations aimed at reducing oil pollution from most tank vessels of 20 000 dwt and above through the use of segregated ballast, side and bottom protective area, and crude oil wash, it is necessary for ship designers to reconsider the overall subdivision scheme of certain tankships. Using cargo carrying capacity considerations, various subdivision schemes of crude oil and product tankships ranging in size from 20 000 to 260 000 dwt are scrutinized. Both new and existing vessels are considered. The schemes differ primarily in number and locations of the longitudinal bulkheads and the presence or absence of double bottoms. In addition, current requirements are summarized in a tabular format, and various existing designs, developed before and after the new regulations came into force, are compared.
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